Process for preparing 2,3-dihydro-1,3-dialkyl-2,3-dialkyl perimidines and N,N-'-dialkyl-1,8-naphthalene diamines
AssigneeHercules Incorporated
InventorPaul J. Shannon
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Abstract
Processes for preparing 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidines and N,N'-dialkyl-1,8-naphthalene diamines are disclosed. The 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidines are prepared by alkylating 2,3-dihydro-2,2-dialkyl perimidines with an alkylating agent in a water miscible organic solvent at room temperature to 80.degree. C. in the presence of water and an inorganic base. N,N'-dialkyl-1,8-naphthalene diamines are prepared by hydrolyzing the 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidines with strong aqueous acid in an aqueous organic solvent and removing a ketone by-product and the aqueous organic solvent by codistillation.
Claims10
A process for preparing N,N'-dialkyl-1,8-naphthalene diamine comprising hydrolyzing of 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidine with strong aqueous acid in an aqueous organic solvent and removing a ketone by-product and the aqueous organic solvent by co-distillation.
A process for preparing N,N'-dialkyl-1,8-naphthalene diamine comprising:
- (a) alkylating 2,3-dihydro-2,2-dialkyl perimidine with an alkylating agent in a water miscible organic solvent at room temperature to 80.degree. C. in the presence of water and an inorganic base to form 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidine;
- and
- (b) hydrolyzing the 2,3-dihydro-1,3-dialkyl-2,2-dialkyl perimidine with strong aqueous acid in an aqueous organic solvent and removing a ketone by-product and the aqueous organic solvent by co-distillation.
Dependencies are inferred from the claim text.